Mod questions

I was thinking of doing a mod with the top hinged, but i dont want screws showing on the outside of the case. What would be the best way to secure the top panel to the rest of the case without having screws on the exterior?Also I want to make part of the mod a refridgerator, but am not sure how to cool it. I was thinking of disassembling some of these: http://www.amazon.com/CoolIT-Systems-Beverage-Chiller-28USB-2d1000-29/dp/B000EDJJMI and placing the cooling pads on the exterior of the area i want cooled, but i was wondering if anyone had a better suggestion.